Image display device and driving method for same for collective write in

Abstract

An image display with high brightness where a long time can be secured for light emission of self-luminous elements can be implemented using only line memories.The period for the writing in of a display voltage (period for writing in of data) continues for a number of lines (three lines), and the reset pulse becomes of a “high” state. Subsequently, operation for three lines is carried out collectively during a triangular wave period (period for writing in of a triangular wave voltage), and only the light emission controlling pulse becomes of a “high” state. During the period for the writing in of a triangular wave voltage, the writing in of a triangular wave voltage from the second time onward is rewriting of a triangular wave voltage, and thus, the period for rewriting the display voltage (dotted line portion) becomes unnecessary, and a longer period for light emission, where the light emission controlling pulse becomes of a “high” state, can be secured.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to an image display device in which an EL (electroluminescence) element, an organic EL element or another self-luminous element which is a self-luminous type display element is mounted, as well as a driving method for the same.[0002]Self-luminous elements, such as EL (electroluminescence) elements and organic EL elements, have such properties that the brightness is proportional to the current which flows through the self-luminous element, and thus, display with gradation is possible by controlling the current which flows through the self-luminous element. A display device can be fabricated by providing a number of such self-luminous elements.[0003]Meanwhile, drive transistors for controlling the current which flows through the self-luminous element are inconsistent in terms of their properties, as a result of the manufacturing process, and this inconsistency in terms of the properties causes inconsistency in the drive cu...

AI Technical Summary

Benefits of technology

The invention is about a driving method for a display device that allows for a long time period for light emission using only a line memory. The method involves dividing the period for writing in a signal and the period for inputting a triangular wave to secure a long time period for light emission within one frame period. By collectively carrying out the writing in operation for multiple lines, the amount of wasteful time during which light cannot be emitted is reduced. The method also allows for variable time for writing in based on the conditions at the time of write in for each line. Overall, the method simplifies the configuration of the peripheral circuit, allows for controllable time for writing in, and corrects differences in the conditions for collective write in of lines to achieve a highly bright display.

Problems solved by technology

However, the entirety of the period for a horizontal retrace line cannot practically be a period for light emission.

As described below in reference to FIG. 4, light cannot be emitted while a signal voltage is being rewritten to a pixel driving voltage (triangular wave), and therefore a long time period for light emission cannot be secured.

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